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Related Experiment Videos

Protein excretion after prolonged exercise

M Robertshaw1, C K Cheung, I Fairly

  • 1Department of Chemical Pathology, Chinese University of Hong Kong.

Annals of Clinical Biochemistry
|January 1, 1993
PubMed
Summary
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Prolonged exercise, like a 100 Km hill walk, significantly increases urinary protein and albumin excretion. This suggests that kidney tubular reabsorption is reduced after strenuous physical activity.

Area of Science:

  • Nephrology
  • Exercise Physiology
  • Biochemistry

Background:

  • Strenuous physical activity can affect kidney function.
  • Understanding exercise-induced changes in urinary protein excretion is important for assessing kidney health.

Purpose of the Study:

  • To investigate the impact of a 100 Km hill walk on urinary excretion of specific proteins and enzymes in healthy individuals.
  • To determine if exercise-induced proteinuria is related to impaired tubular reabsorption.

Main Methods:

  • Collected random urine samples from 16 healthy subjects before and after a 100 Km hill walk.
  • Measured urinary total protein, albumin, N-acetyl-beta-glucosaminidase (NAG), retinol binding protein (RBP), and creatinine.
  • Analyzed changes in excretion rates relative to creatinine and assessed relative clearance.

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Main Results:

  • Significant increases in urinary total protein, albumin, and NAG excretion (relative to creatinine) were observed post-walk.
  • Relative clearance of protein and albumin also increased significantly after the exercise.
  • In a subset of subjects, urinary albumin and NAG levels returned to pre-walk values within 4 days.

Conclusions:

  • Proteinuria following prolonged exercise is, at least in part, caused by reduced tubular reabsorption in the kidneys.
  • The kidneys recover from exercise-induced proteinuria, with markers returning to baseline levels within a few days.